Split in Three

#include <bits/stdc++.h>
using namespace std;
// #define cerr if(false) cerr
#define watch(x) cerr << (#x) << " is " << (x) << endl;
#define endl '\n'
#define ld long double
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define sz(a) (int)(a).size()
#define y1 lsdjkfhshfdsighoihweogihewoghi
#define all(x) (x).begin(), (x).end()

void solve() {
    
}

const int maxn = 105;

int n;
int g[maxn];

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    
    if(n%3 != 2) {
        cout << "IMPOSSIBLE" << endl;
        return 0;
    }

    vector<int> seq = {1, 2, 3, 3, 2, 1};
    int cur = 0;
    for(int i = n; i >= 3; i--) {
        g[i] = seq[cur];
        cur++;
        cur %= sz(seq);
    }

    g[1] = 2;
    g[2] = 3;

    for(int i = 1; i <= n; i++) {
        cout << g[i] << " ";
    }
    cout << endl;
}

/*

*/

// Did you read the bounds?
// Did you make typos?
// Are there edge cases (N=1?)
// Are array sizes proper?
// Integer overflow?
// DS reset properly between test cases?
// Is using long longs causing TLE?
// Are you using floating points?

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 1, 2

Verdict: WRONG ANSWER

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: WRONG ANSWER

Test 8

Group: 1, 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: WRONG ANSWER

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: WRONG ANSWER

Test 15

Group: 2

Verdict: ACCEPTED